Malicious PDF — malware analysis report

Static analysis result for SHA-256 7889666a6e02e5ad…

MALICIOUS

PDF

72.1 KB Created: 2021-09-19 14:48:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 791483cd73b746b275bc877dd066a5a1 SHA-1: 25d3df12d7c8186c0b7884e4679339caaac6951b SHA-256: 7889666a6e02e5adf9720be4b66156924737c72297792981fe8c7f9b4e2b4346
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs, many pointing to disposable domains, and one URL includes a 'utm_term' parameter suggesting a tracking or lure mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document's structure is designed to host many links on potentially untrustworthy sites, reinforcing the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://smidgel.ru/uplcv?utm_term=miui+12.5+redmi+note+9
    • http://windowsplusllc.com/ckfinder/userfiles/files/wonosagumovufaxabileriro.pdf
    • http://blossomtour.net/FileData/ckfinder/files/20210908_6405442D87FB83DB.pdf
    • http://smsgurugram.com/miet/assets/files/vesuwojugositigi.pdf
    • https://plentis.eu/ckfinder/userfiles/files/13306509213.pdf
    • http://elementsgogreen.com/userfiles/file/60039599286.pdf
    • https://shirbandifelt.com/userfiles/file/sixifasipisevigabaxopupiz.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/5u6veakd9dujuoh8d62628uhvd/97097918226.pdf
    • http://sethhukumchandschool.com/userfiles/file/siteletele.pdf
    • http://fkhd.cz/data/img/vulubuwulikuwiv.pdf
    • http://vkp.ru/upload/global/file/vepuxufobojojifobuxuvug.pdf
    • http://rigassprotes.lv/uploadz/file/xukizelagukadinepi.pdf
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/riwakidi.pdf
    • https://locktactyuma.com/ckfinder/userfiles/files/73681730846.pdf
    • https://censcakmu.org/board/file/files/xuludiwifiwewudix.pdf
    • http://sun-apartments.pl/data/pages/faloguroku.pdf
    • http://copingconversations.com/userfiles/file/durapolinux.pdf
    • http://crm333.com/documentos/file/kaxugonetemes.pdf
    • http://nusratali.com/userfiles/files/lilejenim.pdf
    • https://balticstroy.com/uploads/files/22390187789.pdf
    • https://www.khaosanpools.org/ckfinder/userfiles/files/parolositinozupa.pdf
    • http://cyklo-sport-servis.cz/UserFiles/File/57791901680.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/9117e798b5098e48dd898637d9a48d67/zuduxeti.pdf
    • https://projectmine.hu/ckfinder/userfiles/files/26770556988.pdf
    • http://orthopediedelft.eu/files/dumiworajupuretex.pdf
    • http://state-lithium.com/upload/files/nuvinawaforiximafu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b8c6.bin
37e9d7798af31a48487d2055104fde8bf54feb0fd95e6fe380787492640e2da7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB8C6 16200 bytes
font_01_sfnt_off0000e22b.bin
134c5eef52ba7a13b1af9daa32bb4279bf38672eeba2522d9b1d939bff1449fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE22B 10664 bytes
font_02_sfnt_off0000fab2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB2 16792 bytes

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